I've got 2. Most recent one is a 2004 Mach 1. Dealer kept it in their private garage, dealership owner was the one and only owner of it. Got it at 3,000 miles, perfect condition, and they don't make 'em anymore. I'll agree that the interior in some areas feels "cheap" compared to luxury cars for example around the doors I'll definitely agree with that, but look under my hood and tell me if that doesn't make up for the interior's lack of "elegance" per se.
You buy a mustang to drive, not to chauffer. =)